<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<title></title>
		<link rel="stylesheet" href="./Bootstrap4.6.1/css/bootstrap.css">
		<!-- 先引入jquery文件，在引入bootstrap的js文件 -->
		<script src="./Bootstrap4.6.1/js/jquery.js"></script>
		<script src="./Bootstrap4.6.1/js/bootstrap.bundle.js"></script>
		<style>
			div{
				/* 轮廓  -- 效果用法和边框一样，但是不占空间 */
				outline: 1px red solid;
			}
		</style>
	</head>
	<body>
		<div class="container">container</div>
		<div class="container-sm">container-sm</div>
		<div class="container-md">container-md</div>
		<div class="container-lg">container-lg</div>
		<div class="container-xl">container-xl</div>
		<div class="container-fluid">container-fluid</div>
	</body>
</html>